Today the tire is an integral part of the vehicle. During its development is used in various methods. This publication deals with some of them. In her research is necessary to know its features and design solutions. Basic tire structure is described in the first part. These findings are then fit to the other chapters. In the second part there are examples of several tire models in the form of mathematical equations. These equations are used to determine the force and moment loads acting on the tire. The resulting load may aid in the design of new types of tires. The last part describes how to use mathematical models to calculate and here are other methods how else can it gets information about the load on the tire. There is a list of organizations that deal with simulations and tests.